Sash-balance.



V. C. KYLBERG.

SASH BALANCE. APPLICATION FILED AUG-19,1914.

Patented May 2, 1916.

h; FFT@Q 'VESTE G; KYLBERG, 0F MAIPLEWOOD, NEW JERSEY.

SASH-BALANCE.

in the top of the window framing may exert its force on a drum inclosing the same and through said drum on a cable connected with the window sash in a direction tending to balance the sash, the customary pulleys, ropes and weights being dispensed with. v

I provide in the upper window framing two of the springs and drums at each corner portion thereof, one spring and drum at each corner of the window frame being connected by a cable with one sash and the other spring and drum at each corner of the window frame being connected by a cable with the other-sash.

My invention comprises a novel construction and arrangement of the springs and securing equipped with a sash their drums and novel means for adjusting the tension of the springs, the whole resulting in a highly eflicient sash balance and one capable of bein readily installed as well as of great durabi ity.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which:

Figure 1 is a vertical section through one upper corner portion of a wmdow' frame balance constructed in accordance with my invention, the sash balance being shown in vertical section about on the dotted line 1-1 of Fig. 2; Fig. 2 is a horizontal section through the sash balance taken on the dotted line 2-2 of Fig. 1; Fig. 3 is a vertical section through the same taken on the dotted line 3-3 of Fig. 1, and Fig. 4 is a detached new of one of the drums and illustrates the manner of the inner end of the cable thereto.

In the drawings, 10 designates a part of the upper corner portionv of a wlndow frame, 11 a window sash, and 12 the general casing inclosing the features of the sash balance, which comprises at each corner of the window frame, only one cornerhavmg been shown, a pin 13 extending between and con- Specification of Letters Patent.

. Patented May 2, 1916.

Application filed August 19, 1914. Serial No. 857,444.

necting the sides of the casing 12, a pair of arbors 14 rotatably mounted on said pin, a pair of drums 15 rotatably mounted on said arbors, coiled spring 16 within said drums and connected at one end thereto and at the other end to the arbors, worms 17 mounted in the casing-12 and in gear with said arbors, andcables 18 wound upon the drums 15 and connected thereto at their inner ends and thence extending downwardly through openings 19 in the bottom 20 of the casing 12 to the respective sashes to which thelower ends of the cables are secured.

The casing 12 will preferably be formed of sheet metal and comprise in one piece a bottom plate 20, sides 21 and overlapping outer end sections 22, said bottom 20 being formed with an upwardly bent lip 23 to engage the lower outer edges. of the sections 22 and also with the openings 19 through which the cables 18 pass and also with countersunk hubs 2 1 for .the lower ends of the worms 17 and a countersunk hub 25 for a securing screw 26, all of the parts mentioned being stamped out in the form of a blank and then bent into shape. The metal cut from the bottom 20 in making the openings 19 therein is turned downwardly and outwardly to form flanges 27 to engage the adjacent portion 28 of the side of the window frame. The top 29 of the casing 12 is a separate piece bent: into hood form and secured at one end to the casing sections 22 and at the other end being flanged inwardly,

as at 30, and secured to the bottom section 20 of the general casing. The top or hood portion 29 engages the edges of the sides 21. The sides 21 are apertured, and flanged thereat, to afford bearings for the ends of.

the pin 13, said ends being upset slightly so as to connect and secure the sides 21 in proper relation to each other. The sides 21 are also formed with inwardly extending lips 31 which are horizontal and formed with openings to receive the upper reduced ends of the worms 17 said lips serving as bearings for the'upper ends of said worms and being formed from the metal of the sides 21, caving openings 32 in Said sides adjacent to the upper ends of the worms and through which, if necessary, the retaining pins 33 may be inserted through the upper ends of the worms 1? above the lips 31.-

The arbors 1 1, one being provided for each drum 15, are rotatably mounted on the pin 13 and each arbor is formed at its outer end with gear teeth 34: which are in mesh with a vertical worm 17. The arbors 14 are close together at their inner ends and at their outer ends are in close relation to the sides bors are each formed with 35 and a transverse groove inner end of the spring 16 and also a pin 37 by which said end of the spring may be fastened to the arbor. The arbors 14 are cyindrical and afford a bearing or shaft for the drums 15, through the center of which said arbors extend.

The drums 15 are hollow and receive the springs 16 in their interior, while on their exterior said drums receive the cables 18, the inner ends of the cables being preferably connected with the drums 15 in the manner indicated in Fig. 4 and the other ends of the cables being carried downwardly through the openings 19 and secured to the window sashes inthe manner indicated in Fig. 1. The coiled springslG are within the drums 15 and at their outer ends are secured thereto, as at 38. In the construction presented therefore the outer ends of the springs 16 are secured to the rotary drums l5 and the inner ends of said springs are secured to the arbors 14- which'have no rotation except when rotated by the worms 17 for the purpose of adjusting the tension of the springs 16.

The worms 17 are in the shape of vertical spindles suspended bythe lips 31 and having their spiral portion in mesh with the arbors '14 and their lower ends within the upwardly extending hubs 2-4. The lower ends of the worms 17 are slotted toreceive, when necessary, a screw driver, by which the worms may be turned for rotating the arbors 14 and winding up the springs 16, thereby placing such tension as may be necessary upon said springs. The worms 17 normally hold the arbors 1% against rotation.

In the employment of my invention a casa grease-groove 36 to receive the -ing 12, with its contained parts, is secured within the framing over each corner of the window and the cables 18 are respectively connected with the inner and outer sashes. The springs 16 will be under constant tension and this tension may be adjusted at will by means of the worms 17 and arbors 14.

he springs 16 serve to counterbalance the. sashes to the extent necessary, and the structure as a whole will render it unnecessary to employ the usual weights, pulleys and ropes as counterbalances.

I am aware that it is not broadly new to employ a coiled spring in a window-sash counter-balance structure, but I believe my particular construction and arrangement of parts are novel and rovide a counter-balance of improved ei ciency and of great durability and reliability. The structure 21 of the general casing and said ar-'.

of my invention is convenient of location in the window frame and the vertical worms 17 make it entirely easy to adjust the tension of the springs 16. The structure pre sented by me, while durable and efhcient, is also convenient of manufacture and the parts thereof may be readily assembled.

What I claim asv my invention and desire to secure by Letters Patent, is:

1. In a window construction, a frame for the window sashes having above said sashes a. chamber, sash balances located within said chamber comprising a main inclosing casing having a bottom plate closing the opening in the window frame leading to said chamber and affording means for securing the said casing within said chamber, a pin extending transversely of said casing, independent arbors on said pin each having gear teeth on one end thereof, a rotary drum on each of said arbors at one side of the gear teeth thereof, a coiled spring within each drum connected at its outer end thereto and at its inner end to the arbor upon which the drum is mounted, a. cable on each drum connected at one end thereto and extending directly downwardly to and being connected with a sash so that a straight pull may be exerted through the depending portion of the cable, and independent vertical worms respectively in mesh with the teeth of said arbors and exposed at their lower ends at the said bottom plate of said general casing and at said ends being substantially flush with said plate and to be engaged by a tool for turning them in the operation of adjusting the tension of said springs.

2. In a window construction, a frame for the window sashes having above said sashes a chamber, sash balances located within said chamber comprising a main inclosing casing having a bottom plate closing the opening in the window frame leading to said chamberand affording means for securing the said casing within said chamber, a pin extending transversely of said casing and mounted in bearings formed in the sides thereof, independent end-to-end arbors on said pin each having gear teeth on its outer end, a rotary drum on each of said arbors at one side of the gear teeth thereof, a coiled spring within each drum connected at its outer end thereto and at its inner end to the arbor on which the drum is mounted, a cable on each drum connected at one end thereto and extending directly downwardly therefrom to and being connected with a sash so that a straight pull may be exerted through the depending portion of the cable, and independent vertical worms respectively in mesh with the teeth of said arbors and ex posed at their lower ends at the said bottom plate of said general casing and at said ends being substantially flush with said plate and to be engaged by a tool for turn- Signed at New York city,. in the county mg themin the operation of adjusting the of New York and State of New York, this 10 tension of said springs, said bottom plate 17th day of August A. D. 19%.

having upwardly counter-sunk hubs for the 5 lower end", of said Worms and integral lips VESTE KYLBERG' extending inwardly from said sides and Witnesses: apertured to receive and aiford bearings J. R. FRITH, for the upper ends of said worms. CHAS. C. GILL. 

